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How do I determine my cadence???(18 posts)

How do I determine my cadence???kylebike
Sep 18, 2002 11:57 AM
Is their a way to figure out my cadence for a ride??

Thanks
Most obvious way: 1,2,2,3,4,5,6,7.... look at watch. Divide. nmonespeed
Sep 18, 2002 12:00 PM
or get a computer.Steve_0
Sep 18, 2002 12:04 PM
or use this formulatao
Sep 18, 2002 1:26 PM

Speed * factor
cadence = ------------------------------------------

Circumference * ChainRing / Cog


where factor = 1056 for mph or 1666.67 for kph

and Cirum = 84.78 for english and 215.34 for metric

1056 = 63360 inches per mile / 60 minutes
1666.67 = 100,000 cms per km / 60 minutes

84.78 = 27" * 3.14 (pi)
215.34 = 27" * 2.54 (cm / in) * 3.14

for example, if you did a hard stretch and averaged 25mph and used a 53 x 17 your cadence was 100

25 * 1056 / ( 84.78 * 53 / 17 ) = 99.9

or on a steep climb if you were only going 14kph in 39 x 23 your cadence was 64

14 * 1666.67 / (215.34 * 39 / 23) = 63.9

Interesting: how about 105 miles-5hrs20min-42x16 gearing?onespeed
Sep 18, 2002 1:49 PM
700 wheels. (nm)onespeed
Sep 18, 2002 1:53 PM
substitute 82.78 with 82.11 nmSteve_0
Sep 18, 2002 2:02 PM
Help me out Steve_0: I failed algebra. (nm)onespeed
Sep 18, 2002 2:42 PM
Help me out Steve_0: I failed algebra. (nm)Steve_0
Sep 19, 2002 4:15 AM
105 miles in 5.33 hours ~ 19.7 mph
substitute 82.11 for 84.78,
fill in the blanks
should yield 96.51rpm
re: 700 wheels. (nm)tao
Sep 18, 2002 2:52 PM
my 700 wheels with 23 tires measure 27" (68.6 cm) and NOT 70cm (700mm) diameter. What's the deal? Am I so lame that I can't measure, or does 700 mean something else?
Bad measurementKerry
Sep 18, 2002 4:21 PM
If you sit on your bike and do a rollout, there is NO WAY that your 700x23 tires measure 27" diameter. 26.25" (or so) is the standard number for a 700x23. Unweighted, you'll get a little bit higher number. You're doing something wrong (trying to measure diameter with a measuring tape, which has to follow the spoke line and then go over the axel?).
Interesting: how about 105 miles-5hrs20min-42x16 gearing?tao
Sep 18, 2002 2:45 PM
93.4 rpm
Thanks TAO. I am amazed I was able to keep that up.onespeed
Sep 18, 2002 3:11 PM
re: Thanks TAO. I am amazed I was able to keep that up.tao
Sep 18, 2002 3:26 PM
Well when you've got a good stroke, you've got a good stroke.

Maybe I should look into those funny bikes afterall!
Not quite....Steve_0
Sep 19, 2002 4:18 AM
hes running 700c. closer to 95 or 96.
1,2,3,4,5,...fbg111
Sep 18, 2002 12:54 PM
This works for me too, and it's free. Get up to my average distance speed of about 18.5mph (measured on my cheap, non-cadence counting cateye computer), start a 1 minute countdown on my watch, and count till the countdown alarm sounds. Voila.
I can't count that high. I do # of revs for 15 seconds X 4 nmDave Hickey
Sep 18, 2002 1:33 PM
I do # of revs for 6 seconds & add a 0 (nm)flying
Sep 18, 2002 3:23 PM